Three dams in Luzon are already discharging water from their reservoirs due to excessive rainfall from severe tropical storm “Maring” (international name “Kompasu”), the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said on Tuesday, Oct. 12.
As of 4 p.m., Ambuklao and Binga Dams in Benguet each have eight spillway gates open at 7 meters (m) and 7.5 m, respectively.
Both dams have been releasing excess water since Monday, Oct. 11.
Based on PAGASA’s monitoring as of 4 p.m., Tuesday, Ambuklao Dam’s water level has reached 750.75 m, which is close to its 752.0-m normal high water level.
Meanwhile, Binga Dam’s water level was at 573.99 m–just 1.1 m short of its 575.0-meter normal high water level.
The majority of water discharge from Ambuklao Dam flows into Binga Dam, which in turn, releases water to San Roque Dam in Pangasinan.
San Roque Dam’s current water level is 278.93 m, which is about 1 m below its normal high water level of 280 m.
There has been no announcement yet from San Roque dam management that water will be released from the reservoir.
PAGASA said that Magat Dam in Isabela also opened one spillway gate at 3 p.m. on Tuesday.
Its current water level is at 189.19 m or 3.81 m below its 193-m normal high water level.
The catchment of Magat Dam is huge but the reservoir is small thus it tends to be filled up quickly during a heavy rainfall event.